Now Apogee's largest segment following the acquisitions of Sotawall and EFCO, architectural framing systems has consistently grown organically and profitably. It serves a broad spectrum of the non-residential construction market in terms of products, project size and geography, and is more similar to the overall market profile than Apogee's other two architectural segments.
Apogee now has a greater proportion of its revenues generated from mid-size to smaller commercial construction projects, with the architectural glass segment winning share in mid-size projects and the growth of the architectural framing systems segment. These sectors are more steady state throughout an economic cycle and tend to be more weighted toward institutional projects, which also tend to be less volatile.
Apogee is growing its presence in the retrofit market to help offset the inevitable slowdown in new construction. Retrofit is a vast market opportunity, given that three-quarters of the U.S. building stock was constructed before the introduction of energy-efficient glass coatings and often older windows are just a single sheet of glass.
Apogee is introducing new products (NPI) that continue to differentiate Apogee from its competition and fill product gaps, such as CyberShield to reduce electronic eavesdropping, DigitalDistinctions that enables building designers to insert their artistic expressions and Custom Window to preserve the historical look with modern day performance.
Apogee is pursuing new geographies in the United States as well as internationally, including continued growth in Europe from our picture framing business. We've acquired companies in Canada and Brazil, and have expanded our coverage area in the U.S. organically and through acquisitions.
Apogee is expanding into new markets, such as retrofit architectural projects and engineered optics for the large-scale optical segment. These initiatives leverage existing products and expertise to gain share in newer markets.